Constructing a novel Ag nanowire@CeVO_(4) heterostructure photocatalyst for promoting charge separation and sunlight driven photodegradation of organic pollutants  

作　　者：Yan Song Ran Wang Xiuyuan Li Baiqi Shao Hongpeng You Chaozheng He 

机构地区：[1]Institute of Environmental and Energy Catalysis,School of Materials Science and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China [3]University of Science and Technology of China,Hefei 230026,China

出　　处：《Chinese Chemical Letters》2022年第3期1283-1287,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. 21701166, 51472236, 21603109);the National Basic Research Program of China (973 Program,No. 2014CB643803);the Fund for Creative Research Groups (No.21521092);Key Program of the Frontier Science of the Chinese Academy of Sciences (No. YZDY-SSW-JSC018);the Henan Joint Fund of the National Natural Science Foundation of China (No.U1404216)。

摘　　要：Exploiting efficient and recyclable photocatalysts is a vital matter for environmental purification. Herein, cerium vanadate (CeVO_(4)) sub-microspheres and silver nanowire (AgNW)@CeVO_(4) with core-shell architecture as photocatalysts are rationally constructed by hydrothermal approach. The AgNW@CeVO_(4) photocatalyst obtained by depositing CeVO_(4) on the surface of Ag NWs possess one dimensional continuous structure, which expand the optical absorption range and reduce the band gap of CeVO_(4) photocatalyst. Moreover, the resultant AgNW@CeVO_(4) photocatalyst demonstrates superior photocatalytic performance in the degradation of rhodamine B, methylene blue, and 4-nitrophenol pollutants upon solar light irradiation, compared with pure CeVO_(4). The excellent photocatalytic activity can be ascribed to the introduction of Ag NWs, which afford rapid charge transport channels and reservoir for the electrons in the AgNW@CeVO_(4) heterostructure to promote separation of electron-hole pairs. The first-principles investigations reveal increase of adsorption energy of oxygen molecules on the CeVO_(4) surface with the presence of Ag. Meanwhile, Ag NWs can further improve the photocatalytic efficiency of the AgNW@CeVO_(4) based on the plasmonic effect. More importantly, the good structural stability and recyclability of AgNW@CeVO_(4) are observed due to the strong synergistic effect, which ensures long-term usability of photocatalyst and great promise in water purification. This work can offer valuable reference into designs and construction of Ce-based heterojunction photocatalysts for environmental remediation.

关 键 词：Cerium vanadate PHOTOCATALYST HETEROJUNCTION Degradation mechanism FIRST-PRINCIPLES 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学] X703[环境科学与工程—环境工程]